Unexpected use of continue statement. Open
continue;
- Read upRead up
- Exclude checks
disallow continue
statements (no-continue)
The continue
statement terminates execution of the statements in the current iteration of the current or labeled loop, and continues execution of the loop with the next iteration. When used incorrectly it makes code less testable, less readable and less maintainable. Structured control flow statements such as if
should be used instead.
var sum = 0,
i;
for(i = 0; i < 10; i++) {
if(i >= 5) {
continue;
}
a += i;
}
Rule Details
This rule disallows continue
statements.
Examples of incorrect code for this rule:
/*eslint no-continue: "error"*/
var sum = 0,
i;
for(i = 0; i < 10; i++) {
if(i >= 5) {
continue;
}
a += i;
}
/*eslint no-continue: "error"*/
var sum = 0,
i;
labeledLoop: for(i = 0; i < 10; i++) {
if(i >= 5) {
continue labeledLoop;
}
a += i;
}
Examples of correct code for this rule:
/*eslint no-continue: "error"*/
var sum = 0,
i;
for(i = 0; i < 10; i++) {
if(i < 5) {
a += i;
}
}
Compatibility
-
JSLint:
continue
Source: http://eslint.org/docs/rules/
iterators/generators require regenerator-runtime, which is too heavyweight for this guide to allow them. Separately, loops should be avoided in favor of array iterations. Open
for (const converter of converters) {
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disallow specified syntax (no-restricted-syntax)
JavaScript has a lot of language features, and not everyone likes all of them. As a result, some projects choose to disallow the use of certain language features altogether. For instance, you might decide to disallow the use of try-catch
or class
, or you might decide to disallow the use of the in
operator.
Rather than creating separate rules for every language feature you want to turn off, this rule allows you to configure the syntax elements you want to restrict use of. These elements are represented by their ESTree node types. For example, a function declaration is represented by FunctionDeclaration
and the with
statement is represented by WithStatement
. You may find the full list of AST node names you can use on GitHub and use the online parser to see what type of nodes your code consists of.
You can also specify [AST selectors](../developer-guide/selectors) to restrict, allowing much more precise control over syntax patterns.
Rule Details
This rule disallows specified (that is, user-defined) syntax.
Options
This rule takes a list of strings, where each string is an AST selector:
{
"rules": {
"no-restricted-syntax": ["error", "FunctionExpression", "WithStatement", "BinaryExpression[operator='in']"]
}
}
Alternatively, the rule also accepts objects, where the selector and an optional custom message are specified:
{
"rules": {
"no-restricted-syntax": [
"error",
{
"selector": "FunctionExpression",
"message": "Function expressions are not allowed."
},
{
"selector": "CallExpression[callee.name='setTimeout'][arguments.length!=2]",
"message": "setTimeout must always be invoked with two arguments."
}
]
}
}
If a custom message is specified with the message
property, ESLint will use that message when reporting occurrences of the syntax specified in the selector
property.
The string and object formats can be freely mixed in the configuration as needed.
Examples of incorrect code for this rule with the "FunctionExpression", "WithStatement", BinaryExpression[operator='in']
options:
/* eslint no-restricted-syntax: ["error", "FunctionExpression", "WithStatement", "BinaryExpression[operator='in']"] */
with (me) {
dontMess();
}
var doSomething = function () {};
foo in bar;
Examples of correct code for this rule with the "FunctionExpression", "WithStatement", BinaryExpression[operator='in']
options:
/* eslint no-restricted-syntax: ["error", "FunctionExpression", "WithStatement", "BinaryExpression[operator='in']"] */
me.dontMess();
function doSomething() {};
foo instanceof bar;
When Not To Use It
If you don't want to restrict your code from using any JavaScript features or syntax, you should not use this rule.
Related Rules
- [no-alert](no-alert.md)
- [no-console](no-console.md)
- [no-debugger](no-debugger.md)
- [no-restricted-properties](no-restricted-properties.md) Source: http://eslint.org/docs/rules/